\vec{a}

\vec{b}

e = 2.718281828459045
A = Intersect(xAxis, yAxis)
B = (1, 0)
u = Vector(A, B)
D = (0, 1)
v = Vector(A, D)
α = Angle(B, A, D)
β = Angle(D, A, B)
a: cos(α)
tekst3: "\vec{a} \cdot \vec{b} = " + (abs(u) * abs(v) * cos(α))